When Kafka has topic auto-creation turned on, checkpoint topics may be created w/ wrong partition numbers

When Kafka topic auto-creation is turned on in the brokers, a fetch metadata API call will result in topic auto-creation w/ default number of partitions.

In Samza code, we should always try to create the checkpoint/changelog topic w/ the expected number of partitions first, then call fetch metadata to avoid topic auto-creation creating the topic w/ un-wanted number of partitions.